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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e48ae11b1c88044596304f284c72fe38c1e71b985c4479b04714a1e9144a64' 
  AND token = 'CB2CS4D4ruRXlbcXa3F9QuLovaCHSLbN4hjyIHL0jN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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