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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90640affc91a99adc7c08cba3a2a3adbcac42a22a41d8fba0e92e886935bfac3' 
  AND token = 'lNG+g5D0zJe8kdjwSWHpe4MkEjhHSVPOVeFcBQd/RdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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