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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '121e3bbe9c2aad4ea4195c0fede7ee3725349448a18c427d5efd271fe3809530' 
  AND token = 'jUzJbc7ccWn5JKoLjHqA0EReqNNsUuI1dJOOjKFhHBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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