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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '577bfa1e9ab383cba0cd084bcb36e1c0025e9d85a1b3fd3001779a30dd7b5907' 
  AND token = 'N5zjtLJq2qnhMvyHvTzUr95jsUDYPjyxNG/y5frZx20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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