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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bd3163eb48d43c6a6ccd65c31fca7418af4098d4678a5483ee5e3f5a0218eef' 
  AND token = '3uxEAaIZPd6dPoj+0ipKp7kQjTSgsdQ4+wQArjkW+a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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