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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd853935c2fd6563e37066218a02bc50deb9169eb9519b52bf2f050436775d63' 
  AND token = 'qECim3o83Dz7DI3iWfAwMJzVfIP0pEh/p9KSc2uMUrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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