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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10c1e2ae1530824a8f136dcbabeb0f82c3e2d026b9454c9be7b9ce4058d4309c' 
  AND token = 'ky8jf4moDPJSF+vlOvC2jGt1wz/rWGe4/NJcDjM5D6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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