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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa8feca8199e920c61f2f4746bafc83cbb7849bd10326f81ab5ac9ed962a41c' 
  AND token = 'G5IxS9Vbpb1A0B/AauQ69z51rWCzvOdWwymRiCPSoqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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