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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86ebd10c61eab722b8af1985aaca8d744c00533e98beca0bfc2bfc2100ed4e69' 
  AND token = 'frzPAK+o0W+yTZLeb2pAmRsfjVgrIFNi94HW6m8Wxvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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