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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dbbe14ade4f6b464c33d20c62c1fb7a48365f3237ced6bcc70bda3883c93a08' 
  AND token = 'y+DaCLpV7H4MO+WkdnOcTROVZpoaMRBMvRpfUcSIE+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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