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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d0de684db4fc5e28c88f34a9a050c0f3c69942bbd963791a51242d8e35afa2' 
  AND token = 'f7aGycQDABoTCm1UI01VuWJrYDRIWrH9S7d5H8xH+NM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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