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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04f0556b7e322d747da6dfb41851e6e77aa5e55eda699e5afa62125e1b36a6b4' 
  AND token = 'r0yhTyuYcyPwnWpliNpLdFzp0JHSiPh+70LANn5gau0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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