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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd02623f64753cf43a65b97fcee743049b70d40071956aabb2b09ffb0d6766e70' 
  AND token = 'zz046h91R7IiDAWelkPiK82aBUGBBDuqeGz7f7mAGK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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