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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e182b977ba462ead88f4df50a4513b0278db329db84bd4b002f1c97eb1035c1' 
  AND token = 'qlz5+Mq71MVlbQVuoaC7wuhFAfU10uC80pvw38rgq7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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