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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6bb78a4278c8656d77a7f89180c0c91bcb21c99ed34cd641ae6d34ca206a67' 
  AND token = 'kuhJTEsUTGL9otL02k1GZYjxjA26R6wYDpOIgrF/EqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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