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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce66cc01b38f070b68f45f5f6db3817dcc5ad73ddcba7e50b559cb20a8cf1ec1' 
  AND token = 'Ooq8Xs4oqW7NHOx7lPfbuLfz+SXSuZMOXjAIs2J8kas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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