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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd46b474f9f135ac949c3c3c6d72d5fa1b316ac0146dc2ab6bd5379fb3814e080' 
  AND token = 'uTjX/HcVHK1tHBv3Sn5cuYU2Ka6177qprAVVpXNF9Vo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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