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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f24e5b86718c56bf4887dcd2d3c330ab3071cba5e4d4da11ebb586490df207' 
  AND token = '13X1bavfiMF3fCRflV7PKFmjM2dHiAJbI6pkp3KMK0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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