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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa98acfa5c1e5b44614d6baec6b7326fc2d64f628bcacc750bef0a52bf248d30' 
  AND token = 'GpBIBHgaMkQVN9DJjvd/Owh0m8j9QGXcMGgDaou1eQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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