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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfe87e547131e5de1740517c819b004859fc5f74f96df991c0291d2352d14765' 
  AND token = 'KEU4LXMD6bSDZo7TorZC+GieUm8tGkT+AntW8AdrkME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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