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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04935f552a9ef498cafe8861a937bd3674372714e1e537c78c774d5af5abc4cf' 
  AND token = '87V4RClR/RrEIy1B5KKxQwqiOqvgKSI5bcnXVmjeyTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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