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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e93b38101fd143d4a81c0d22dca8b03adfa5d401f56856545784bd64d1337c' 
  AND token = 'sgF9ccBFbCfaQt8hAZA3wPlam+KAEwbS9Cw7DRhXcS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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