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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196ec7a110871a36c8e327be40e4a13e3ac70cc3b3a74dbf4886d52346326f8e' 
  AND token = '2XWnKUsjpevk5R4eZ4WJ3h060KEVNr6W6Tv2485XEVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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