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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8467e3bfa39af3c19fad84b3e79fc6e789c1238b60c5748c34c64266658c7e56' 
  AND token = 'r6+1M/L3/CQrJE1Qpaz3+VcYKNZv1KmoAG8r5+8psX4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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