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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ad1d3d2188a97483039482fe2278ab6d40d02244a505867b4a18a36d16af95' 
  AND token = 'c7rnX8wW8Ae/JH8A8JTChqW5NK2jbp38r2GP7gNnfEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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