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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3b614a1816611b863b7e78250d45d6f09c88a57c2697db5a1853270ef8a355' 
  AND token = 'oo8JPFrGrVdhL3CrHmTX6zF3gjQ5b3EhU+8pT2Q4hy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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