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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9813730b3be4380c4f3fdd38f51c0d6a8d739108d86a6caed0593ec398415a86' 
  AND token = 'vwh5EBFL+Cm0sxlF+hTV6ENx8XOy2/N4iis/5MSMnpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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