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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '769dbcc7759ee7b74427d40af52449eca0e138709a47f0b62a615fd90c4ad51c' 
  AND token = 'I87edi09lPRuos9Fbj5RyqMFUtfectlKjuRUZNmu9V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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