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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5817769b38f1e8b6bb0c9a1e87abbc39eefd5d9abb8181b6a15e9a21a7762ae' 
  AND token = 'j30UvU199KjE+/bbc2+5sENUoPwZbiSXi/SKS6XmVX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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