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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8490ba8e54693c212ca74b8bbd7e41d122688c2bc634ba2093f7bdaacfbec6d8' 
  AND token = 'SKOdMaeZX+8L2rsqwM+5kCHzkN1et+ORNf2uZpDwqGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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