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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccecd322bff82a2d7afd8d1111d38d91af1bb79333b7d1aec3a13aac25ec276e' 
  AND token = 'n44+SrIFMREFpX9btAH3DkvAAM7ADOnHgZZ4XE8rjmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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