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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9493017ab02898975d42b70df12aa0591e0192dbbecc58acd6c38b2b0e561411' 
  AND token = '6ur+1bnytWVU9+j7w+xZsXmWOuFYbW3dTrIu10jipmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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