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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6baa6e38ccc0572264d83dcb5026de265231e238298c71ba11c3967dc673019' 
  AND token = 'fyncGM4/6IIh5DjyRUg0MP5TPjF4wYxgrEeq5bnAftc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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