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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612a513156c868ec35711767c6feff8532d57fd7b1967752d86cf05663ef37f4' 
  AND token = 'JrUewhHpc7B6OkpNq1YNuyxFktnOE9zMautT4G80GD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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