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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d499b6b1a60772c88a67957de47817adb9455fc39e468fdf7d9dcb977c99e1' 
  AND token = '1vIkqJz13FRijQnFlWv1O6LbpQZsMOskhzakq2kr4kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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