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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85bf6d89cff96b8b310d03a86ad5e7264f537110c5273456b7253da7572086a5' 
  AND token = '6emWu2zyEh76aoVRx2Q09yMPYnefmisAapBS8BcD3Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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