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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5d660e1c45e81d014cec61bd15a53f71b881a53490af1e2ca532d1b177ee17' 
  AND token = '07bT6+qzOg5E3rO8ONObAwQLnwqELtzC7TLJcy4PLQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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