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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2192c3c7c51803f87dfd05f0d593469cb048d1c4bac08255b3c199f1c63feb3c' 
  AND token = '5rNjueX+8U1nVybqDD2AikqdnQGH+2ZwfYbcDya19F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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