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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af14f2bf562722856777674a38c9e2b8e4d76bb4bd61277c9946bab3477985d' 
  AND token = '5RDCQMYam3wnh+5EI2A3his1UUZcXWPaWcdzMy+8fns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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