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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbe3fba2a28cf20f02da6994967118d629147c82667894117f891f3737b4331' 
  AND token = 'jBe+bxyavPVUjP/Dx2gtx19sfEUJNZLGA1ePXvz4l2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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