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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a7071a6220eecb546821f7903b54d37a7711167d81b03577af2b13b13c5bb3e' 
  AND token = 'DQmyNeFh7ijRe48Ne3TSG8dKK8ex5QJrChn1zYHJ9iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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