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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82a11c62d940a4d3adb0d5ce3ab8b42ba5b10fd60b6973caf8ed0c8b88992cca' 
  AND token = 'ZTCQro/X8DYDhSqaxlkglndWz6moQX8DDOiAPXtHE3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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