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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62401086304fafedd2b565a407b2aa22a8ef83761d336b94a690ed348d1915d5' 
  AND token = '3mFjoEPzOGejLWZMPw8bIVmZmckboeLrm0jd1Bz4DBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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