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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3ad76fd8f6ccafc5ac732067ae9cb80e7bf917aa88c1cac738368b464b4906' 
  AND token = 'tpE0pfMYsYWFi6w2DeL8kkZ9yUA6DQH6ZCsxG/sYxnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}