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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fb53c11819a107ff60c254777780f6dc785f266de82b9a6692b6c0473416b6c' 
  AND token = 'sWSh196KvoD9NN/PY+vuu9F0l1K8h4vluS9/3pBRg+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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