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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9441a619c7388b79ae7892b8dfa0be60c8af175e0ac52a854a0f1c9e4dab2f18' 
  AND token = 'M0FpTlXo2807iu16757NYj2IMN3wi7/jWtt/oj2xMFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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