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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11404d29ff1c7174458c2b97d1acfd42648a3c94229fd897b2d98f4ec4e8bef6' 
  AND token = 'ZPNcmKRwpZ1MZgDoFeo6RW3ryx3KtOKL4nZYDESYFkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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