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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64bdc20941e79c64d7cfc1fb0c8a7d4be6a35f50880e25e62e39afdfc00be962' 
  AND token = 'apc5rtEq5+/9QT+gFzo5bLWXkKJxGGKnW4XO//QWfcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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